Hm, I'd love to see what and how you did everything and compared the methods! I'm curious how you know if salts, and how much, were in the final solution?

Also, are you using lye/caustic soda/sodium hydroxide (NaOH) as your neutralizing agent or lime (Ca(OH)2) as stated in the first post??? Keeping the sodium out to begin with is probably the best theory of all!